US4184540A - Rotary heat exchanger - Google Patents

Rotary heat exchanger Download PDF

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Publication number
US4184540A
US4184540A US05/861,555 US86155577A US4184540A US 4184540 A US4184540 A US 4184540A US 86155577 A US86155577 A US 86155577A US 4184540 A US4184540 A US 4184540A
Authority
US
United States
Prior art keywords
container
heat exchanger
heat
pipes
heat exchange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/861,555
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English (en)
Inventor
Bertel Myreen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JP-ENERGY POHJOINEN HESPERIANKATU 37A SF-00260 HELSINKI 26 FINLAND A CORP OF FINLAND Oy
Original Assignee
Ra Shipping Ltd Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ra Shipping Ltd Oy filed Critical Ra Shipping Ltd Oy
Application granted granted Critical
Publication of US4184540A publication Critical patent/US4184540A/en
Assigned to JP-ENERGY OY, POHJOINEN HESPERIANKATU 37A, SF-00260 HELSINKI 26, FINLAND A CORP. OF FINLAND reassignment JP-ENERGY OY, POHJOINEN HESPERIANKATU 37A, SF-00260 HELSINKI 26, FINLAND A CORP. OF FINLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RA-SHIPPING LTD. OY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D11/00—Heat-exchange apparatus employing moving conduits
    • F28D11/08—Heat-exchange apparatus employing moving conduits more than one conduit assembly performing independent movements, e.g. rotary bundle of tubes in a rotary drum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D11/00—Heat-exchange apparatus employing moving conduits
    • F28D11/02—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller
    • F28D11/04—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller performed by a tube or a bundle of tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/135—Movable heat exchanger
    • Y10S165/139—Fully rotatable
    • Y10S165/152—Rotating agitator
    • Y10S165/154—Hollow tubing rotates in vessel to stir contents
    • Y10S165/155—Tubing has radially or axially extending sections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/903—Convection

Definitions

  • the present invention ralates to a heat exchanger wherein a liquid, in particular a suspension, is heated or cooled by causing the suspension to flow through a container in which a substantially horizontal heat exchange unit consisting of a pipe set has been rotatably mounted.
  • a relative velocity between wall and fluid is required. This is normally accomplished by allowing the fluid to flow through sufficiently narrow closed flow ducts which are confined by the heat transfer wall in part at least.
  • the fluid is a suspension with a relatively high content of solid particles, it will be viscid whereby a high inlet pressure has to be generated by means of a pump in order to transport the suspension through the flow passages of the heat exchanger. There is even a high risk that the flow passages are blocked by the solid material present in the suspension, and likewise the risk that this material within a short time may form a coat on the heat transfer wall detrimental to heat flow.
  • a relative velocity of the suspension with respect to the heat transfer wall may also be produced in that with the aid of a drive the heat transfer wall is set in motion within a stationary or slowly flowing suspension. In such case a pump is not absolutely necessary to transport the suspension through the heat exchange apparatus.
  • the Swedish Pat. No. 384,569 discloses a heat exchanger featuring a rotating heating loop. This loop then rotates in a container totally filled with the heat-receiving fluid. In case this fluid is viscid and there are several layers of tubes in radial direction in the rotating tube set, the tube set will also tend to impart a rotation to the contents of the container, whereby the relative velocity of contents and tube set with reference to each other, which is necessary for heat transfer, will be low.
  • the object of the present invention is to provide a heat exchanger fitted with a rotating tube set wherein the rotation of the container's contents is prevented, and wherein a high relative velocity is obtained even between a viscid suspension and the heat transfer wall and, moreover, in such a manner that it is easy to clean the heat transfer wall of deposits.
  • a central tube has been concentrically disposed in relation to the rotational axis of the heat exchange unit between the end pieces among the heat transfer tubes, the diameter of the central tube being not less than 40% of the largest distance between any two heat transfer tubes, measured at right angles to the rotational axis, at least the lower edge of the outlet from the container being located at a level lower than the topmost part of the central tube, so that the latter can be kept above the free liquid level in the container.
  • FIG. 1 illustrates the apparatus in the form of a schematic vertical section carried through the rotational axis of the heat exchanger unit
  • FIGS. 2 and 3 show the same means, presented in a schematic vertical section at right angles to the rotational axis along the lines indicated by II--II and III--III respectively in FIG. 1;
  • FIGS. 4 and 5 show a vertical section along the line indicated by IV--IV of FIG. 1, with the movement of the suspension in the apparatus indicated in them;
  • FIG. 6 shows the apparatus of FIG. 1, schematically viewed from above.
  • 1 is the container through which the suspension is caused to flow with inflow through the inlet 2 and withdrawal by the outlet 30.
  • the container may be opened the top or provided with cover 4.
  • the rotating heat exchange unit has been accommodated, its shaft 5 on the drive side being carried in the bearing 6 and sealed against the container within the seal 7.
  • the heat exchange unit has a double jacketed hollow shaft 8, which is carried on the outside of the container in the bearing 9 and has been sealed against the container within the seal 10.
  • the hollow shaft terminates in a double packing box 11, which has been connected to the inlet 12 and outlet 13 of the heat exchange fluid.
  • This fluid may be, for instance, cooling water, hot water or condensing steam.
  • the inlet 12 and outlet 13 communicate by the hollow shaft 8 in open connection each with one of the mutually separated compartments 14 and 15 in an end piece 16.
  • an equivalent end piece 17 is found on the driven side of the apparatus.
  • These end pieces are connected to an air-filled central tube 18 disposed concentrically around the rotational axis.
  • On the outside of the central tube between the end pieces 16 and 17 are a plurality of pipe lines 19, which constitute open connections between the end pieces and the compartments 14, 15 and 20 separated by means of partitions, and which arrangement compels any liquid introduced into the end piece to flow through series-connected pipe bundles of pipe lines 19 connected in parallel.
  • the apparatus comprises supporting plates 21 affixed to the central tube 18, these plates having cut-outs so as to cause each plate to brace or support part of the pipes 19 and at the same time to leave open another part 22, through which the suspension may flow in axial direction.
  • the cut-outs 22 of different supporting plates may be totally omitted.
  • the container 1 is cylindrical in its lower part with merely a narrow gap between the outermost of pipes 19 and the container wall. Upwardly from the plane of the rotational axis the walls of the container are preferably vertical, so that the rotating part may be lifted out of the container if required.
  • the structure supporting the apparatus has not been depicted in FIGS. 1-6. It is of a conventional kind and it is so constructed that the axis of the heat exchange unit is horizontal or has an inclination so that the end of the apparatus where the inlet of the suspension is located has a higher elevation than the outlet end.
  • the apparatus operates in a continuous steady state in one of two alternative ways. According to one of these ways, the heat exchange unit rotates within the container in a direction such that the pipe lines move upwardly on that side where the inlet 2 of the suspension is located. This is illustrated by FIG. 4.
  • the outlet 3 of the suspension Since the outlet 3 of the suspension is located at an elevation lower than the inlet 2, partly due to its placement in the container 1 and partly owing to the potential inclination of the apparatus with reference to the horizontal plane, the suspension will only partially fill the container 1 and there will be a free suspension surface in the apparatus.
  • This free suspension level will, as a result of the heat exchange unit's rotation, adjust itself at a higher level 23 on the suspension inlet side from the central tube 18 compared with the level 24 on the opposite side.
  • This difference in level produces a flow of suspension at right angles to the pipes 19 and to their direction of motion.
  • the flow in axial direction is adjusted by means of the cut-outs 22 in the supporting plates 21 and the suspension is withdrawn, for instance, by free overflow through the outlet 3 at the other end of the apparatus.
  • the pressure drop encountered as the suspension flows at right angles to the pipes 19 may be balanced by the static differential pressure which arises from the difference in level between surfaces 23 and 24, in such manner that the surface 23 will not rise past the highest point 25 of the central tube 18.
  • the suspension is hereby prevented from rotating along with the heat transfer pipes 19, and one achieves the relative velocity which is necessary for efficient heat transfer, between the heat transfer pipes 19 and the suspension.
  • the central tube affords requisite rigidity to the rotating part of the apparatus.
  • the second mode of use is illustrated by FIG. 5.
  • the heat exchange unit rotates in such direction within the container that the pipe lines 19 move downwardly on the side where the inlet 2 of the suspension is located.
  • the free surface of the suspension 23 on the suspension outlet side from the central tube 18 will be at an elevation higher than the free surface 24 on the opposite side.
  • the supporting plates 21 prevent free axial flow of the suspension from inlet to outlet.
  • the outlet may be located on the same elevational level as the inlet.
  • the inlet 2 and outlet 3 of the suspension are chutes with a free surface.
  • the inlet and outlet may equally be closed pipelines, in which connection modified places of connection and which permit the maintaining of a free liquid level in the container are possible without diversion from the scope of the invention.
  • the apparatus may also be used to warm and cool liquids containing no solid particles.
  • the heat transfer pipes are easy to clean on the side which is in contact with the suspension, even without any need to empty the apparatus, since all heat transfer pipes can be brought into a position in which they are above the suspension surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US05/861,555 1976-12-16 1977-12-16 Rotary heat exchanger Expired - Lifetime US4184540A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI763619A FI58395C (fi) 1976-12-16 1976-12-16 Roterande vaermevaexlare
FI763619 1976-12-16

Publications (1)

Publication Number Publication Date
US4184540A true US4184540A (en) 1980-01-22

Family

ID=8510505

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/861,555 Expired - Lifetime US4184540A (en) 1976-12-16 1977-12-16 Rotary heat exchanger

Country Status (5)

Country Link
US (1) US4184540A (sv)
FI (1) FI58395C (sv)
IE (1) IE46277B1 (sv)
SE (1) SE7714208L (sv)
SU (1) SU799680A3 (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11300357B2 (en) * 2018-04-02 2022-04-12 Yoshino Gypsum Co., Ltd. Multitubular rotary heat exchanger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115628607A (zh) * 2022-10-18 2023-01-20 攀钢集团钛业有限责任公司 一种用于干燥湿20钛精矿的间接式换热装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB313780A (en) * 1928-07-11 1929-06-20 Charles Mcneil Improvements relating to heat-exchanging devices
US1828799A (en) * 1931-03-16 1931-10-27 Carlson Carl Thomas Heat exchanger
US2205431A (en) * 1937-08-03 1940-06-25 Jr Oscar A Olson Heat exchange apparatus
FR1166095A (fr) * 1956-02-09 1958-11-03 Ponndorf Maschinenfabrik K G Séchoir rotatif à faisceau tubulaire pour le séchage de la drêche ou d'une matière floconneuse analogue
US3182719A (en) * 1962-01-10 1965-05-11 Escher Wyss Ag Multitubular heat exchanger
US3351131A (en) * 1964-04-09 1967-11-07 Grenobloise Etude Appl Heat exchangers
DE1263036B (de) * 1961-04-01 1968-03-14 Ingeborg Laing Als trommelfoermiger Geblaeselaeufer ausgebildeter Waermetauscher
US3852892A (en) * 1974-05-06 1974-12-10 D Sheehan Rotary drum dryer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB313780A (en) * 1928-07-11 1929-06-20 Charles Mcneil Improvements relating to heat-exchanging devices
US1828799A (en) * 1931-03-16 1931-10-27 Carlson Carl Thomas Heat exchanger
US2205431A (en) * 1937-08-03 1940-06-25 Jr Oscar A Olson Heat exchange apparatus
FR1166095A (fr) * 1956-02-09 1958-11-03 Ponndorf Maschinenfabrik K G Séchoir rotatif à faisceau tubulaire pour le séchage de la drêche ou d'une matière floconneuse analogue
DE1263036B (de) * 1961-04-01 1968-03-14 Ingeborg Laing Als trommelfoermiger Geblaeselaeufer ausgebildeter Waermetauscher
US3182719A (en) * 1962-01-10 1965-05-11 Escher Wyss Ag Multitubular heat exchanger
US3351131A (en) * 1964-04-09 1967-11-07 Grenobloise Etude Appl Heat exchangers
US3852892A (en) * 1974-05-06 1974-12-10 D Sheehan Rotary drum dryer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11300357B2 (en) * 2018-04-02 2022-04-12 Yoshino Gypsum Co., Ltd. Multitubular rotary heat exchanger

Also Published As

Publication number Publication date
FI58395C (fi) 1981-01-12
IE46277L (en) 1978-06-16
SU799680A3 (ru) 1981-01-23
FI763619A (fi) 1978-06-17
SE7714208L (sv) 1978-06-17
FI58395B (fi) 1980-09-30
IE46277B1 (en) 1983-04-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: JP-ENERGY OY, POHJOINEN HESPERIANKATU 37A, SF-0026

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RA-SHIPPING LTD. OY;REEL/FRAME:003943/0725

Effective date: 19811221

Owner name: JP-ENERGY OY, POHJOINEN HESPERIANKATU 37A, SF-0026

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RA-SHIPPING LTD. OY;REEL/FRAME:003943/0725

Effective date: 19811221